Flowers are always nice but I wouldn't take them with you. I'd send her flowers to be delivered to her house as a congratulations for being nominated. Then also hand carry a business-like gift. Nice pens are always great for something like that.
Staples has some executive-style, leather yet feminine portfolios. I recently got one that is very stylish and it wasn't expensive at all. i don't see it on the website but if you check your local store, i'm sure they're in stock.